552 research outputs found
CP Violation via Interference
We consider , where
decays to and is any hadronic final state, such as or
. We find a large direct CP asymmetry in B-meson decays via
interference. A possible method to determine weak phases, such as ,
is discussed. The experimental feasibility is also shown.Comment: 7 pages, latex(sprocl.sty included), 2 figures. Talk presented at
"Int. Conf. on B-physics and CP violation" Hawaii 9
Dynamical Electroweak Symmetry Breaking from Extra Dimensions
We study the dynamical electroweak symmetry breaking (DEWSB) in the -dimensional bulk with compactified extra dimensions. We identify
the critical binding strength for triggering the DEWSB, based on the ladder
Schwinger-Dyson equation. In the top mode standard model with extra dimensions,
where the standard model gauge bosons and the third generation of quarks and
leptons are put in the bulk, we analyze the most attractive channel (MAC) by
using renormalization group equations (RGEs) of (dimensionless) bulk gauge
couplings and determine the effective cutoff where the MAC coupling exceeds the
critical value. We then find that the top-condensation can take place for D=8.
Combining RGEs of top-Yukawa and Higgs-quartic couplings with compositeness
conditions, we predict the top mass, GeV, and the Higgs mass,
GeV, for D=8, where we took the universal compactification scale
TeV.Comment: 8 pages, Talk given at the 2002 International Workshop On "Strong
Coupling Gauge Theories and Effective Field Theories" (SCGT 02), Nagoya,
Japan, 10-13 December 200
Renormalization in the Gauged Nambu--Jona-Lasinio Model
Based on the Cornwall-Jackiw-Tomboulis effective potential, we extensively
study nonperturbative renormalization of the gauged Nambu-Jona-Lasinio model in
the ladder approximation with standing gauge coupling. Although the pure
Nambu-Jona-Lasinio model is not renormalizable, presence of the gauge
interaction makes it possible that the theory is renormalized as an interacting
continuum theory at the critical line in the ladder approximation. Extra higher
dimensional operators (``counter terms'') are not needed for the theory to be
renormalized. By virtue of the effective potential approach, the
renormalization (``symmetric renormalization'') is performed in a
phase-independent manner both for the symmetric and the spontaneously broken
phases of the chiral symmetry. We explicitly obtain function having a
nontrivial ultraviolet fixed line for the renormalized coupling as well as the
bare one. In both phases the anomalous dimension is very large ()
without discontinuity across the fixed line. Operator product expansion is
explicitly constructed, which is consistent with the large anomalous dimension
owing to the appearance of the nontrivial extra power behavior in the Wilson
coefficient for the unit operator. The symmetric renormalization breaks down at
the critical gauge coupling, which is cured by the generalized renormalization
scheme (``\tM-dependent renormalization''). Also emphasized is the formal
resemblance to the four-fermion theory in less than four dimensions which is
renormalizable in expansion.Comment: 72 pages, 12 figures (not included), LaTeX file, KEK-TH-344/KEK
preprint 92-86/CHIBA-EP-65/DPNU-92-2
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